When to tell your boss you are recruiting for PE pre-MBA associate jobs?

Hello everyone. I'm currently a second year analyst in the process of speaking to recruiters for PE opportunities. I've kept things to myself for now, but not sure if I should let my boss know when i start to interview. For reference, I work at a middle market bank with smaller industry coverage groups (5-12 from first year to MD) so it is much harder to fly under the radar. My initial thought is to wait until I get further down the path, but don't want to have to sneak around. Also, he is pretty well connected in the industry, so was thinking it could perhaps be helpful?